Wave-energy-translating diaphragm and method of mounting same



July 3, 1928. 1,675,853

H. C. HARRISON WAVE ENERGY TRANSLATING DIAPHRAGM AND METHOD OF MOUNTINGSAME Filed July so, 1924 by My? 60 a concave-sha Patented July 3, 1928.a I UNITED: STATES PATENT OFFICE.

mBY C. HARRISON, OFPORT'WASHINGTON, NEW YORK, ASSIGNOB TO WESTERNELECTRIC COMPANY, INCORPORATED, NEW YORK, I. Y., A COBPOBATIOI OI roux.

3 wavaannar-rmsna'rme 'n'mrnnaex m mn'rnon or nomnw am Applicationflledluly so, 192 4. Serial No. 729,002.

This invention relates to wave energy translating diaphra s and methodof mounting the same. ore specifically it refers to a diaphragm mountingof a type .5 particularly well adapted foruse 1n telephone,transmitters, receivers, phonographs andthelike' fl The object of thisinvention the provision of a diaphragm mounting which will '10 besimple, efiicient, cheap to manufacture andwherein the diaphragm istensioned in a simple and ositive manner.

.A feature 0 the invention resides in the rovision ofmeans whereby thediaphragm I is tensioned and free to vibrate uniformly to each side ofits normalrestmg plane.

Another feature is the provision of means whereby the dia hragm istensioned progressively to its a justed period of vibration.

I) Another feature is the provision of means whereby the diaphragm isyieldingly held during the initial tig tening applied to its mountinfor" removmg any unevenness 1n the blanE. a

Another feature is the rovision of a rin of yieldable materialv fororcing portions .0

' the diaphragm into circular grooves in the mounting for tensionin thediaphragm un formly to any desired equency.

80 Other features and advantages will appear from the following descrition andby the claims appended thereto, re eren ce bem had to theaccompanying draw ngs in whic Fig. 1 is an assembly view of the mountingas with the upper ring, the soft metallic-ringand the diaphragmpartially cut away.

Fig. 2 is a sectional view ofthe mountingtaken approximately on line 22of Fig, 1. Fi 3 1s a sectional view of the'mounting showing thediaphragm positioned between the grooved ring and the soft metallicring;

and

- showing the rin' in position when the dia- 46 phragm is'stretc ed toits required tension. Similar reference characters refer to similar artsthroughout this description. The diaphragm mounting of this inventionconsists of a metallic ring 11 which has surface 12 and a guide portion13 a apted for holding a soft metallic ring 14 in adjusted positioninthe concave portion 12.

The diaphragm 15 is mounted between the Fig.4 is '1. view similar tothat of Fig. 3,

- ring to tension the diaphragm.

rin 14 of relatively soft metal, such as lea and the ring 16 which isprovided with a plurality of concentric corrugations or grooves 17 madeof decreasing depth toward the center as shown in F i 2.

The ring 14 and the diaphragm 15 are 00 clamped between rings 11' and bymeans of a plurality of screws -18 dis osed in a circular row around theflange o rin 11 in engagement with similarly disposed t readed holes inthe ring 16. The edge of the concave portion 15' is adapted to engageand force the periphery of t e diaphragm and ring 14 into t e outermostdisposed groove 17 of ring 16 through a relatively slight tlghtenin ofscrews 18. This initial pressure resu ts in stretching the diaphragmuniformly and removes any unevennes in the blank partly due to the factthat the material used for ring 14 is sufliciently mal-- leable topermit a small amount of slippage between the effective surface of thering 14 in contact with the diaphragm andthe corrugated rtion 17 incontact with the oppgsite si e of-the diaphragm. By applying rtherpressure on "the clamping rings through the tightening of screws 18,concentric portions of the diaphragm are rogressively forced into thecorrugations 1 The diap ragm is then positively held therein b means ofthe'soft metallic ring 14 whic gradually takes the form defined by theoooperating gripping portion of rings 11 and 2. In a mounting or a wave.energy 'translating diaphragm, the combination with superposed clampingrings, a ring of malleable material associated with said rings, adiaphragm interposed between one of said clamping rings and themalleable 10s ring, and means rmed in one of said rings for stretchingsaid diaphragm uniformly.

3. In a mounting for a wave energy trans- 1 of the diap latingdiaphragm, the combination witha concave-shaped ring, a superposed flatring, a plurality of concentrlcallp disposed annularmembers formed insai the flat ringi1 and means for forcing portions bi said members fortensioning said diap ra uniformly.

4'. a mounting having 1p 1ng ortions, a diaphragm and a ring o sofimatgrial disposed between said portions, ti htenin meansvassociate'dwith said rings or forcmg portions of the soft material into saidgripping ortions for stretching the diaphragm uniormlyr ,4

5. In a mounting'for-awave energy trans superposed clamping rings,ag-recessed portion in men said rings, a plurality of concentriccorrugations formed in the other ring, a diaphragm fastening means forsecuring said diaphragm between said rings, and means interposed,between said :.dia-.

phragm and the recessed portion of thering for forcing portions of thediaphragm or ten-- into the grooves of said other ring sioning saiddiaphragm uniformly.

' 6. In a mounting, apair of superposed flat ring, a 'dia-. phragminterposed between the concave and ragm into the groovesformed for awave energy trans lating diaphragm, a pairvof superposed rings ing-t emounting-blocl;

hragm to take t e shape of 'one' of said gures for 'tensioning saiddiaphragm uni- .forrnlI ;i a mounting, a pair of superposed rings havingcooperating portions shaped toform different eometrical figures, a waveenergy translating diaphragm and. a ring of flmalleable materialinterposed. between said portions, and fastening means to cause thediaphragm to take the shape of one of said figures and the ring to takethe shape 0% both of said figures for tensioning the dia p m latingdiaphragm, the combination with T8.

uniformly. v he' method of mounting and tensioning wave energytranslatingdiaphragms by subjectin the diaphragm and a ring of [softcorrugated and concave surfaces of" two clam ing rings, and ogressively''tightenfor-positively hold- .H lVRY 0.1 HARRISON.

:material to an miti'alpressure' between the '55 ing the diaphragm'itoits a j sted Position

